/* md5.c - Functions to compute MD5 message digest of files or memory blocks
-Copyright (C) 1996 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
-Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+ according to the definition of MD5 in RFC 1321 from April 1992.
+ Copyright (C) 1995, 1996, 2001, 2003 Free Software Foundation, Inc.
+ NOTE: The canonical source of this file is maintained with the GNU C
+ Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2, or (at your option) any
+ later version.
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>. */
+/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#include <sys/types.h>
-#if STDC_HEADERS || defined _LIBC
-# include <stdlib.h>
-# include <string.h>
-#else
-# ifndef HAVE_MEMCPY
-# define memcpy(d, s, n) bcopy ((s), (d), (n))
-# endif
-#endif
+#include <stdlib.h>
+#include <string.h>
#include "md5.h"
+#include "unlocked-io.h"
#ifdef _LIBC
# include <endian.h>
# if __BYTE_ORDER == __BIG_ENDIAN
# define WORDS_BIGENDIAN 1
# endif
+/* We need to keep the namespace clean so define the MD5 function
+ protected using leading __ . */
+# define md5_init_ctx __md5_init_ctx
+# define md5_process_block __md5_process_block
+# define md5_process_bytes __md5_process_bytes
+# define md5_finish_ctx __md5_finish_ctx
+# define md5_read_ctx __md5_read_ctx
+# define md5_stream __md5_stream
+# define md5_buffer __md5_buffer
#endif
#ifdef WORDS_BIGENDIAN
# define SWAP(n) (n)
#endif
+#define BLOCKSIZE 4096
+/* Ensure that BLOCKSIZE is a multiple of 64. */
+#if BLOCKSIZE % 64 != 0
+/* FIXME-someday (soon?): use #error instead of this kludge. */
+"invalid BLOCKSIZE"
+#endif
/* This array contains the bytes used to pad the buffer to the next
64-byte boundary. (RFC 1321, 3.1: Step 1) */
ctx->buflen = 0;
}
-/* Put result from CTX in first 16 bytes following RESBUF. The result must
- be in little endian byte order. */
+/* Put result from CTX in first 16 bytes following RESBUF. The result
+ must be in little endian byte order.
+
+ IMPORTANT: On some systems it is required that RESBUF is correctly
+ aligned for a 32 bits value. */
void *
md5_read_ctx (ctx, resbuf)
const struct md5_ctx *ctx;
}
/* Process the remaining bytes in the internal buffer and the usual
- prolog according to the standard and write the result to RESBUF. */
+ prolog according to the standard and write the result to RESBUF.
+
+ IMPORTANT: On some systems it is required that RESBUF is correctly
+ aligned for a 32 bits value. */
void *
md5_finish_ctx (ctx, resbuf)
struct md5_ctx *ctx;
FILE *stream;
void *resblock;
{
- /* Important: BLOCKSIZE must be a multiple of 64. */
-#define BLOCKSIZE 4096
struct md5_ctx ctx;
char buffer[BLOCKSIZE + 72];
size_t sum;
sum = 0;
/* Read block. Take care for partial reads. */
- do
+ while (1)
{
n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
sum += n;
- }
- while (sum < BLOCKSIZE && n != 0);
- if (n == 0 && ferror (stream))
- return 1;
- /* If end of file is reached, end the loop. */
- if (n == 0)
- break;
+ if (sum == BLOCKSIZE)
+ break;
+
+ if (n == 0)
+ {
+ /* Check for the error flag IFF N == 0, so that we don't
+ exit the loop after a partial read due to e.g., EAGAIN
+ or EWOULDBLOCK. */
+ if (ferror (stream))
+ return 1;
+ goto process_partial_block;
+ }
+
+ /* We've read at least one byte, so ignore errors. But always
+ check for EOF, since feof may be true even though N > 0.
+ Otherwise, we could end up calling fread after EOF. */
+ if (feof (stream))
+ goto process_partial_block;
+ }
/* Process buffer with BLOCKSIZE bytes. Note that
BLOCKSIZE % 64 == 0
md5_process_block (buffer, BLOCKSIZE, &ctx);
}
- /* Add the last bytes if necessary. */
+ process_partial_block:;
+
+ /* Process any remaining bytes. */
if (sum > 0)
md5_process_bytes (buffer, sum, &ctx);
memcpy (&ctx->buffer[left_over], buffer, add);
ctx->buflen += add;
- if (left_over + add > 64)
+ if (ctx->buflen > 64)
{
- md5_process_block (ctx->buffer, (left_over + add) & ~63, ctx);
+ md5_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
+
+ ctx->buflen &= 63;
/* The regions in the following copy operation cannot overlap. */
memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
- (left_over + add) & 63);
- ctx->buflen = (left_over + add) & 63;
+ ctx->buflen);
}
- buffer += add;
+ buffer = (const char *) buffer + add;
len -= add;
}
/* Process available complete blocks. */
- if (len > 64)
+ if (len >= 64)
{
- md5_process_block (buffer, len & ~63, ctx);
- buffer += len & ~63;
- len &= 63;
+#if !_STRING_ARCH_unaligned
+/* To check alignment gcc has an appropriate operator. Other
+ compilers don't. */
+# if __GNUC__ >= 2
+# define UNALIGNED_P(p) (((md5_uintptr) p) % __alignof__ (md5_uint32) != 0)
+# else
+# define UNALIGNED_P(p) (((md5_uintptr) p) % sizeof (md5_uint32) != 0)
+# endif
+ if (UNALIGNED_P (buffer))
+ while (len > 64)
+ {
+ md5_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
+ buffer = (const char *) buffer + 64;
+ len -= 64;
+ }
+ else
+#endif
+ {
+ md5_process_block (buffer, len & ~63, ctx);
+ buffer = (const char *) buffer + (len & ~63);
+ len &= 63;
+ }
}
/* Move remaining bytes in internal buffer. */
if (len > 0)
{
- memcpy (ctx->buffer, buffer, len);
- ctx->buflen = len;
+ size_t left_over = ctx->buflen;
+
+ memcpy (&ctx->buffer[left_over], buffer, len);
+ left_over += len;
+ if (left_over >= 64)
+ {
+ md5_process_block (ctx->buffer, 64, ctx);
+ left_over -= 64;
+ memcpy (ctx->buffer, &ctx->buffer[64], left_over);
+ }
+ ctx->buflen = left_over;
}
}
{ \
a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \
++words; \
- CYCLIC (a, s); \
+ a = rol (a, s); \
a += b; \
} \
while (0)
- /* It is unfortunate that C does not provide an operator for
- cyclic rotation. Hope the C compiler is smart enough. */
-#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s)))
-
/* Before we start, one word to the strange constants.
They are defined in RFC 1321 as
- T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
+ T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64, or
+ perl -e 'foreach(1..64){printf "0x%08x\n", int (4294967296 * abs (sin $_))}'
*/
/* Round 1. */
argument specifying the function to use. */
#undef OP
#define OP(f, a, b, c, d, k, s, T) \
- do \
+ do \
{ \
a += f (b, c, d) + correct_words[k] + T; \
- CYCLIC (a, s); \
+ a = rol (a, s); \
a += b; \
} \
while (0)
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